Sofa



FIG. 1 is a perspective view of a sofa showing the new design;

FIG. 2 is a front view of the sofa;

FIG. 3 is a rear view of the sofa;

FIG. 4 is a left side view of the sofa; and,

FIG. 5 is a right side view of the sofa. 

CLAIM The ornamental design for a sofa, as shown and described. 